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x in (-oo:+oo)
(1.05*x)/100 = 1/20 // - 1/20
(1.05*x)/100-(1/20) = 0
(1.05*x)/100-1/20 = 0
0.0105*x-1/20 = 0 // + 1/20
0.0105*x = 1/20 // : 0.0105
x = 1/20/0.0105
x = 4.76190476
x = 4.76190476
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